I'm new to reefing, although I've kept salt fish for 40 years. I never cleaned out my sump which was setup and running for 22 years. That tank started to leak so I decided to get a bigger tank and transition into reefing. When I shut down the old system I discovered over 1-1/2" of detritus and other gunk in the bottom of the sump. I vowed to do better when reefing. I bought Eheim's Quick Vac Pro which I hope will allow me to clean up the sump bottom easily every quarter, or so.